I have a niece named [name_f]Char[/name_f]/lotte, and her sister is T/ess/a (censored to make it unsearchable), so that’s always a cute back up, if you’re looking for ideas
(might be a little biased though)!
As for your list though, here’s my two-cents 
[name_u]Evelyn[/name_u] - While I like [name_u]Evelyn[/name_u], I’ve never been able to love it. It’s pretty and very on-trend which is a nice thing, imo, but I can never get myself to fall in love with it. It does however work nicely with big sister [name_f]Charlotte[/name_f], I just feel like you have nicer options to choose from!
[name_f]Emily[/name_f] - [name_f]Emily[/name_f] is darling! I know many have grown tired of it at this point because it was so popular for so long, but I still adore it. It’s classic and works beautifully with [name_f]Charlotte[/name_f]!
[name_f]Annabelle[/name_f] - I adore [name_f]Annabelle[/name_f], it’s stunning, and so underrated, imo. I don’t think the horror series as deterred people from using it too much, as it’s still ranking relatively high in the US, Australia and [name_f]England[/name_f]/[name_m]Wales[/name_m] (#141 in the US, #67 in Australia, #78 in [name_m]Wales[/name_m], #77 in [name_f]England[/name_f], #76 combined between E&W). I think it’s just fine to use still, and it’s probably my #1 choice with big sis [name_f]Charlotte[/name_f]!
[name_f]Isabelle[/name_f] - [name_f]Isabelle[/name_f] is beautiful, but to me, it pales in comparison to [name_f]Annabelle[/name_f]. There was a bit of a surge in popularity here about a decade or more ago where [name_f]Isabelle[/name_f] was used incredibly often in my area, it feels like I still hear it everywhere. It just feels a bit dull for me now, but it’s still a lovely choice.
[name_f]Chloe[/name_f] - Oh I adore [name_f]Chloe[/name_f]! It’s relatively high on my list with S/O for when we have children. It’s so lovely, and it feels like a “modern classic” imo - much like [name_f]Lauren[/name_f], [name_f]Megan[/name_f], [name_f]Olivia[/name_f], [name_f]Samantha[/name_f], etc. Names that have been pretty consistent over the last 30 or so years - always in use sort of thing. A lot of people I know aren’t fans of that, but I think it sells me on the name more. I don’t know if it’s my favourite with [name_f]Charlotte[/name_f], but they certainly do work well for sisters!
[name_u]Vivian[/name_u]/[name_u]Vivien[/name_u]/[name_f]Vivienne[/name_f] - While I do like [name_f]Vivienne[/name_f] (my favourite spelling), I don’t love it, it’s always felt like one of those names that’s over-suggested on various name sites. I know that not everyone it’s suggested to uses it, but it feels like I’ve seen it so often, I’ve grown tired of it. It is nice, butderfully together, but if you’re someone who may be put off by popularity, I would maybe pass on [name_f]Emma[/name_f].
[name_f]Lillian[/name_f] - [name_f]Lillian[/name_f] is so sweet! My younger sister was nearly [name_f]Lillian[/name_f] [name_f]Charlotte[/name_f]/[name_f]Charlotte[/name_f] [name_f]Lillian[/name_f], so I’m a bit biased on this one, but I think it makes for a perfect sister name to [name_f]Charlotte[/name_f]!!
[name_f]Emma[/name_f] - [name_f]Emma[/name_f] is gorgeous, I know it’s one of (if not the) most popular names in the world right now, but it still hasn’t put me off of it yet! [name_f]Emma[/name_f] and [name_f]Charlotte[/name_f] pair wonderfully together, imo.
In short, my top three to go with big sis [name_f]Charlotte[/name_f] would be [name_f]Annabelle[/name_f], [name_f]Lillian[/name_f] and [name_f]Emily[/name_f]/[name_f]Emma[/name_f]!